METHODS FOR WORKING HOT BLAST STOVES. 83
However, a description of some of the main features and principles involved in * ' iron stoves ' ' cannot but be of value to many.
The plans and workings of an iron stove should first be considered. There are several different methods used in .piping an iron stove. Those commonly employed have the inverted U and straight pipes, as shown in Figs. 16 and 17. The inverted U pipe in Fig. 1 6 is the same as those used in the iron stove illustrated in Fig. 15. This oven contains forty-four of such pipes, there being eleven in a row and four rows in the length of the oven. The length and height of the oven are shown. The width is twelve feet. As the pipes stand up in the oven there is about three inches space between them. The
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knobs seen at T, Fig. 16, form ^e space of division between them. The section seen in Fig. 17, page 84, is what is called ' ' straight pipe. ' ' The division bar X answers the same purpose as making the pipes of a U form, owing to the rib X running up within about six inches of the top end of the pipe, when erected in the oven. A similar partition as at X is also in the bed pipe ; this causes the blast to pass up one side and come down the other, thus serving the same purpose as the pipe at Fig. 16. The straight pipes have the advantage of being more easily handled in taking them out of an oven when they burn out or crack, as they often do. The top. of the oven is so constructed that the plate can be removed to permit bad pipes being hoisted out by means of an erected pole on the outside of the oven. It is far from being an easy or pleasant job to replace burnt
^\ jout, or competition gets too keen, they will no doubt be largely replaced by the brick stoves.ding " or "slips" from the use of fine ores, etc. It may also beency :|,